The Octonauts The Octonauts and the Urchin Invasion (2010– ) Online
- Original Title :
- The Octonauts and the Urchin Invasion
- Genre :
- TV Episode / Animation
- Year :
- 2010–
- Cast :
- Ross Breen,Teresa Gallagher,Simon Greenall
- Type :
- TV Episode
- Time :
- 23min
- Rating :
- 6.7/10
Urchin Invasion: The Octonauts head to the kelp forest to visit Shellington's sister, Pearl, and her newborn son Periwinkle - only to find the forest endangered by an infestation of kelp-eating urchins! Lionsmane Jelly: A lionsmane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc.
| Episode credited cast: | |||
 | Ross Breen | - | Captain Barnacles (singing voice) |
 | Teresa Gallagher | - | Dashi (voice) |
| Simon Greenall | - | Captain Barnacles (voice) |
| Shelley Longworth | - | Additional Voices (voice) |
| Michael Murphy | - | Vegimals (voice) |
 | Paul Panting | - | Peso (voice) |
| Rob Rackstraw | - | Kwazii (voice) |
 | Keith Wickham | - | Professor Inkling / Shellington (voice) |
 | Jo Wyatt | - | Tweak (voice) |